Are mapped east of Rita Blanca Creek in southeastern Hartley Co, TX (Palo Duro basin), TX panhandle. Map unit described to be comprised of upper and lower parts. Upper part: sand, bentonitic clay, and thin-bedded calcareous sandstone; thickness 50 ft or more. Lower part: dark, distinctly laminated clay, some interbeds of sand and thin uniform layers of nonmarine dolomite; fossils include plants and small fish; thickness 30 ft or more. Assigned to the Pleistocene.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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